From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To: Linus Walleij <linus.walleij@linaro.org>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Chaotian Jing <chaotian.jing@mediatek.com>
Cc: "linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Stephen Boyd <sboyd@codeaurora.org>,
Andy Gross <andy.gross@linaro.org>
Subject: Re: Regression after "do not use CMD13 to get status after speed mode switch"
Date: Thu, 20 Oct 2016 16:17:15 +0100 [thread overview]
Message-ID: <bb6c1f05-d81c-4284-5831-c9d49bf038f3@linaro.org> (raw)
In-Reply-To: <CACRpkdbfNq+R9U9AwsKBM=xyKKTzyVDkiW4jqJ0Nb2LXvq20BA@mail.gmail.com>
Hi Linus,
On 17/10/16 15:32, Linus Walleij wrote:
> Hi Chaotian,
>
> my Dragonboard 8060 has a regression on detecting the eMMC after
> bisecting it down to this patch (which is sadly already in v4.8):
>
> commit 08573eaf1a70104f83fdbee9b84e5be03480e9ed
> Author: Chaotian Jing <chaotian.jing@mediatek.com>
> Date: Thu May 19 16:47:41 2016 +0800
> mmc: mmc: do not use CMD13 to get status after speed mode switch
>
> Before this patch the eMMC is detected and all partitions enumerated
> immediately, but after the patch it doesn't come up at all, except
> sometimes, when it appears minutes (!) after boot, all of a sudden.
>
> Do you have any ideas on what can be wrong?
I remember hitting timeout issue with new version of eMMC on SD600c-eval
board, this patch/hack fixed it for me.
https://git.linaro.org/people/srinivas.kandagatla/linux.git/commitdiff/e42d7427b9ce77174eef079be0e04e22bdb8fd07?hp=3e4bf0b78405694fd1ab4371c73e80932be21e3a
Also one more important thing was to do with regulator mode too.
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=93b8e6fda11757a20df21f3fc18e12789841f173
Can you give it a try.. If it works I can clean it up and send it for
review.
Thanks,
srini
>
> This is the Qualcomm MMCI variant whid does *not* support
> busydetection in hardware.
>
> I will continue looking at it but would be happy for any hints on how to
> solve it, currently I cannot mount root off the eMMC because of this.
>
> Yours,
> Linus Walleij
> --
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>
next prev parent reply other threads:[~2016-10-20 15:17 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-17 14:32 Regression after "do not use CMD13 to get status after speed mode switch" Linus Walleij
2016-10-18 4:06 ` Ritesh Harjani
2016-10-19 1:03 ` Stephen Boyd
2016-10-18 8:36 ` Linus Walleij
2016-10-18 13:23 ` Adrian Hunter
2016-10-19 16:41 ` Ulf Hansson
2016-10-20 2:22 ` Chaotian Jing
2016-10-20 7:06 ` Ulf Hansson
2016-10-20 7:19 ` Adrian Hunter
2016-10-20 11:00 ` Ulf Hansson
2016-10-27 10:04 ` Ulf Hansson
2016-10-31 13:09 ` Adrian Hunter
2016-11-01 1:43 ` Chaotian Jing
2016-11-02 8:19 ` Adrian Hunter
2016-11-02 10:28 ` Chaotian Jing
2016-11-02 12:51 ` Adrian Hunter
2016-11-03 3:39 ` Chaotian Jing
2016-10-20 15:17 ` Srinivas Kandagatla [this message]
2016-10-24 14:23 ` Linus Walleij
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